* refactor: move `irep_remove_lv` from `mruby-bin-strip` gem to src/dump and rename to `mrb_irep_remove_lv`
* add: mrbc option `--remove-lv` to remove LVAR section
Previous version ignored some errors, and didn't free memory and close files.
Now no memory will be dynamically allocated to simplify error handling.
This commit also fixes a wrong check:
files[i] = fopen(argv[i], "wb");
if (!ireps[i]) {
Improve error messages a bit and add missing newline to one.
yuri